School districts that were affected by a PowerSchool data hack in December are now facing extortion attempts by cyber criminals, according to the K-12 ed-tech company.

Software maker said it paid its attackers even as the true size of the theft is still unknown.

Months after the hacked education software maker PowerSchool paid a hacker’s ransom to delete the company’s banks of stolen student data, at least one school district says it is now being extorted by someone who said the data was not destroyed.